Question

1. the following are acceptable measures of room air filtration, except which one? a ○ hepa b ○ opening windows for fresh air flow c ○ ulpa d ○ short - range fans to recirculate the air

Explanation:

HEPA (High - Efficiency Particulate Air) and ULPA (Ultra - Low Penetration Air) are types of air filters. Opening windows for fresh air flow is a natural way of air exchange. Short - range fans to recirculate the air do not filter the air effectively as they just move the existing air around without removing particles as HEPA, ULPA or bringing in fresh air like opening windows.

Answer:

D. Short - range fans to recirculate the air